DP Chemistry (first assessment 2025)
Question 22M.2.HL.TZ2.3d(ii)
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.HL.TZ2.3d(ii) |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Explain | Question number | d(ii) | Adapted from | N/A |
d(ii).
[Maximum mark: 2]
22M.2.HL.TZ2.3d(ii)
(d(ii))
Explain the electron domain geometry of NO3−.
[2]
Markscheme
three electron domains repel
OR
three electron domains as far away as possible ✔
trigonal planar
OR
«all» angles are 120° ✔
Examiners report
The majority of candidates deduced the correct electron domain geometry scoring the first mark including cases of ECF. Only a small number of candidates satisfied the requirements of the markscheme for the explanation.
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.4—The valence shell electron pair repulsion (VSEPR) model enables the shapes of molecules to be predicted from the repulsion of electron domains around a central atom. Predict the electron domain geometry and the molecular geometry for species with up to four electron domains.